MongoCollection::remove
(PECL mongo >=0.9.0)
MongoCollection::remove — Remove records from this collection
Description
$criteria = array()
[, array $options = array()
]] )Parameters
-
criteria -
Query criteria for the documents to delete.
-
options -
An array of options for the remove operation. Currently available options include:
"w"
See Write Concerns. The default value for MongoClient is 1.
-
"justOne"
Specify
TRUEto limit deletion to just one document. IfFALSEor omitted, all documents matching the criteria will be deleted. "fsync"
Boolean, defaults to
FALSE. If journaling is enabled, it works exactly like "j". If journaling is not enabled, the write operation blocks until it is synced to database files on disk. IfTRUE, an acknowledged insert is implied and this option will override setting "w" to 0.Note: If journaling is enabled, users are strongly encouraged to use the "j" option instead of "fsync". Do not use "fsync" and "j" simultaneously, as that will result in an error.
"j"
Boolean, defaults to
FALSE. Forces the write operation to block until it is synced to the journal on disk. IfTRUE, an acknowledged write is implied and this option will override setting "w" to 0.Note: If this option is used and journaling is disabled, MongoDB 2.6+ will raise an error and the write will fail; older server versions will simply ignore the option.
"socketTimeoutMS"
Integer, defaults to MongoCursor::$timeout. If acknowledged writes are used, this sets how long (in milliseconds) for the client to wait for a database response. If the database does not respond within the timeout period, a MongoCursorTimeoutException will be thrown.
"w"
See Write Concerns. The default value for MongoClient is 1.
"wTimeoutMS"
How long to wait for write concern acknowledgement. The default value for MongoClient is 10000 milliseconds.
The following options are deprecated and should no longer be used:
"safe"
Deprecated. Please use the write concern "w" option.
"timeout"
Deprecated alias for "socketTimeoutMS".
"wtimeout"
Deprecated alias for "wTimeoutMS".
Return Values
Returns an array containing the status of the removal if the
"w" option is set. Otherwise, returns TRUE.
Fields in the status array are described in the documentation for MongoCollection::insert().
Errors/Exceptions
Throws MongoCursorException if the "w" option is set and the write fails.
Throws MongoCursorTimeoutException if the "w" option is set to a value greater than one and the operation takes longer than MongoCursor::$timeout milliseconds to complete. This does not kill the operation on the server, it is a client-side timeout. The operation in MongoCollection::$wtimeout is milliseconds.
Changelog
| Version | Description |
|---|---|
| 1.5.0 |
Added "wTimeoutMS" option, which replaces
"wtimeout". Emits
Added "socketTimeoutMS" option, which replaces
"timeout". Emits
Emits |
| 1.3.4 | Added "wtimeout" option. |
| 1.3.0 |
Added "w" option.
The |
| 1.2.11 |
Emits E_DEPRECATED when
options is scalar.
|
| 1.2.0 | Added "timeout" option. |
| 1.0.11 | Disconnects on "not master" errors if "safe" is set. |
| 1.0.9 |
Added ability to pass integers to the "safe" option, which previously only accepted booleans. Added "fsync" option. The return type was changed to be an array containing error information if the "safe" option is used. Otherwise, a boolean is returned as before. |
| 1.0.5 | Changed second parameter to be an array of options. Pre-1.0.5, the second parameter was a boolean indicating the "safe" option. |
Examples
Example #1 MongoCollection::remove() with justOne example
<?php
$radioactive = $db->radioactive;
// count how much more plutonium there is
$remaining = $radioactive->count(array('type' => 94));
$halflife = $remaining/2;
// remove half of it
while ($halflife > 0) {
$radioactive->remove(array('type' => 94), array("justOne" => true));
$halflife--;
}
?>
See Also
- MongoCollection::insert() - Inserts a document into the collection
- MongoCollection::update() - Update records based on a given criteria
- MongoDB core docs on » remove.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- MongoDB
- Базовые классы
- Функция MongoCollection::aggregate() - Perform an aggregation using the aggregation framework
- Функция MongoCollection::aggregateCursor() - Execute an aggregation pipeline command and retrieve results through a cursor
- Функция MongoCollection::batchInsert() - Inserts multiple documents into this collection
- Функция MongoCollection::__construct() - Creates a new collection
- Функция MongoCollection::count() - Counts the number of documents in this collection
- Функция MongoCollection::createDBRef() - Creates a database reference
- Функция MongoCollection::createIndex() - Creates an index on the specified field(s) if it does not already exist.
- Функция MongoCollection::deleteIndex() - Deletes an index from this collection
- Функция MongoCollection::deleteIndexes() - Delete all indices for this collection
- Функция MongoCollection::distinct() - Retrieve a list of distinct values for the given key across a collection.
- Функция MongoCollection::drop() - Drops this collection
- Функция MongoCollection::ensureIndex() - Creates an index on the specified field(s) if it does not already exist.
- MongoCollection::find
- Функция MongoCollection::findAndModify() - Update a document and return it
- Функция MongoCollection::findOne() - Queries this collection, returning a single element
- Функция MongoCollection::__get() - Gets a collection
- Функция MongoCollection::getDBRef() - Fetches the document pointed to by a database reference
- Функция MongoCollection::getIndexInfo() - Returns information about indexes on this collection
- Функция MongoCollection::getName() - Returns this collection's name
- Функция MongoCollection::getReadPreference() - Get the read preference for this collection
- Функция MongoCollection::getSlaveOkay() - Get slaveOkay setting for this collection
- Функция MongoCollection::getWriteConcern() - Get the write concern for this collection
- Функция MongoCollection::group() - Performs an operation similar to SQL's GROUP BY command
- Функция MongoCollection::insert() - Inserts a document into the collection
- Функция MongoCollection::parallelCollectionScan() - Returns an array of cursors to iterator over a full collection in parallel
- Функция MongoCollection::remove() - Remove records from this collection
- Функция MongoCollection::save() - Saves a document to this collection
- Функция MongoCollection::setReadPreference() - Set the read preference for this collection
- Функция MongoCollection::setSlaveOkay() - Change slaveOkay setting for this collection
- Функция MongoCollection::setWriteConcern() - Set the write concern for this database
- Функция MongoCollection::toIndexString() - Converts keys specifying an index to its identifying string
- Функция MongoCollection::__toString() - String representation of this collection
- Функция MongoCollection::update() - Update records based on a given criteria
- Функция MongoCollection::validate() - Validates this collection
Коментарии
To remove a document based on its ID, you need to ensure that you pass the ID as a MongoID object rather than just a string:
<?php
$id = '4b3f272c8ead0eb19d000000';
// will not work:
$collection->remove(array('_id' => $id), true);
// will work:
$collection->remove(array('_id' => new MongoId($id)), true);
?>
If you try to remove a document that doesn't exist, remove() won't throw an exception.
Even if 'w' is set to 1, remove() will return an array similar to this:
Array ( [n] => 0 [connectionId] => 10726 [err] => [ok] => 1 )
So, in order to see if a remove() was really successful, you need to look at [n] key. If it's 0, that means the remove() did not remove any documents.
If remove() is successful, [n] will be > 0.